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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of the Company's Financial Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Financial Assets: |  |  |
Cash and cash equivalents | $ 84,717 | $ 95,191 | $ 75,391
Investment securities available for sale | 1,290,015 | 1,413,081 |
Derivative assets | 10,543 | 10,101 |
Preferred equity and mezzanine loan investments, carrying value | 99,213 | 108,567 |
Financial Liabilities |  |  |
Financing arrangements | 1,179,961 | 1,276,918 |
Subordinated debentures, carrying value | 45,000 | 45,000 |
Convertible notes, carrying value | 129,738 | 128,749 |
Distressed residential mortgage loans held in securitization trusts, carrying amount | 105,851 | 121,791 |
Distressed residential mortgage loans |  |  |
Financial Liabilities |  |  |
Distressed residential mortgage loans held in securitization trusts, carrying amount | 105,900 | 121,800 |
Distressed residential mortgage loans |  |  |
Financial Assets: |  |  |
Residential mortgage loans held in securitization trusts, net | 184,700 | 209,700 |
Financial Liabilities |  |  |
Distressed residential mortgage loans held in securitization trusts, carrying amount | 290,600 | 331,500 |
Equity Method Investments |  |  |
Financial Assets: |  |  |
Investment in unconsolidated entities, carrying value | 8,519 | 8,320 |
Investments in unconsolidated entities, estimated fair value | 45,152 | 42,823 |
Portfolio Investments |  |  |
Financial Liabilities |  |  |
Financing arrangements | 1,179,961 | 1,276,918 |
Residential collateralized debt obligations |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 62,198 | 70,308 |
Multi-family collateralized debt obligations |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 8,838,841 | 9,189,459 |
Residential mortgage loans, at fair value | Distressed residential mortgage loans |  |  |
Financial Assets: |  |  |
Residential mortgage loans held in securitization trusts, net | 96,900 | 36,900 |
Residential mortgage loans, at fair value | Second Mortgage |  |  |
Financial Assets: |  |  |
Residential mortgage loans held in securitization trusts, net | 72,300 | 50,200 |
Available-for-sale securities |  |  |
Financial Liabilities |  |  |
Investment securities, available for sale held in securitization trusts | 50,134 | 47,922 |
Level 1 |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 84,717 | 95,191 |
Cash and cash equivalents, estimated fair value | 84,717 | 95,191 |
Level 3 |  |  |
Financial Assets: |  |  |
Mortgage loans held for sale, net, carrying value | 4,750 | 5,507 |
Mortgage loans held for sale, net, estimated fair value | 5,090 | 5,598 |
Mortgage loans held for investment, carrying value | 1,760 | 1,760 |
Mortgage loans held for investment, estimated fair value | 1,900 | 1,900 |
Preferred equity and mezzanine loan investments, carrying value | 176,741 | 138,920 |
Preferred equity and mezzanine loan investments, estimated fair value | 178,848 | 140,129 |
Investment in unconsolidated entities, carrying value | 53,671 | 51,143 |
Investments in unconsolidated entities, estimated fair value | 53,737 | 51,212 |
Financial Liabilities |  |  |
Secured debt, carrying value | 61,026 | 81,537 |
Secured debt, estimated fair value | 65,894 | 87,891 |
Subordinated debentures, carrying value | 45,000 | 45,000 |
Subordinated debentures, estimated fair value | 45,000 | 45,002 |
Level 3 | Residential collateralized debt obligations |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 62,198 | 70,308 |
Secured debt, estimated fair value | 59,635 | 66,865 |
Level 3 | Multi-family collateralized debt obligations |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 8,838,841 | 9,189,459 |
Secured debt, estimated fair value | 8,838,841 | 9,189,459 |
Level 3 | Residential mortgage loans held in securitization trusts |  |  |
Financial Assets: |  |  |
Residential mortgage loans held in securitization trusts, net | 66,047 | 73,820 |
Residential mortgage loans held in securitization trusts, net, estimated fair value | 65,118 | 72,131 |
Level 3 | Distressed residential mortgage loans |  |  |
Financial Assets: |  |  |
Residential mortgage loans held in securitization trusts, net | 290,645 | 331,464 |
Residential mortgage loans held in securitization trusts, net, estimated fair value | 292,592 | 334,765 |
Level 3 | Residential mortgage loans, at fair value |  |  |
Financial Assets: |  |  |
Residential mortgage loans held in securitization trusts, net | 169,197 | 87,153 |
Residential mortgage loans held in securitization trusts, net, estimated fair value | 169,197 | 87,153 |
Level 3 | Multi-family loans held in securitization trusts |  |  |
Financial Assets: |  |  |
Residential mortgage loans held in securitization trusts, net | 9,345,360 | 9,657,421 |
Residential mortgage loans held in securitization trusts, net, estimated fair value | 9,345,360 | 9,657,421 |
Level 2 |  |  |
Financial Assets: |  |  |
Derivative assets | 10,543 | 10,101 |
Financial Liabilities |  |  |
Convertible notes, carrying value | 129,738 | 128,749 |
Convertible notes, estimated fair value | 137,338 | 140,060 |
Level 2 | Portfolio Investments |  |  |
Financial Liabilities |  |  |
Financing arrangements | 1,179,961 | 1,276,918 |
Level 2 | Distressed residential mortgage loans |  |  |
Financial Liabilities |  |  |
Financing arrangements | $ 192,233 | $ 149,063 |

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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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